Pliers



Aug. 30, 1927. 1,640,723

J. w. RYAN PLIERS Filed Dec. 1. 1926 IN V EN TOR.

4]. WRya 'z BY 5 S Q g ATTORNEY Patented Aug. 30, 1927.

. UNITED STA 5. P T OFFICE.

mm W. RYAN, or FRENCH'CAMP,CALIFORNIA.

PLIERsI Y Application filed December This invention'relates to improvements in pliers such as arecommonly used for grip ping and turning'small pins, rods, nuts and jthe like. As such pliers are usually con structed it is a hard mannerto. keep the V jaws from slipping on the part being proportion tothat used, in contractingthe V handles, or which is, obtainable with ordinary pliers. In otherwords additionalqor boosting leverage means has been placed between .the handle and the; jaws, operable when the handles are. contracted and the;

awsresist closing movement, which, increases theiorce tending-to-close the aws without the useof very heavy pressure on-the handles, and without making the handles of an excessive Flength,

These parts'are soarrangedthat thisad- 4 "ditional leverageor force function's-automatically whenever the handles are contracted and pressure is applied in the usual man ner to turn the. object being gripped. by the pliers; No manual adjustments are-therefore necessary to,;,cause the pliers' to --thus function, and the gripping pressure of the jaws will be instantly and automatically released as soon a'sthe contracting pressure 1, 1926, Serial No. 151,899.

pressureon the j aws to be brought into operation' Fig.2 is a similar view of the pliers after the handles arev contracted and the jaws gripped against the nut.

,Fig. 3 a ,iragmentary cross section on. the line-3-3 otFig. 2.

. Referring now more particularly to the characters of reference onthedrawings, the device comprises a pa r of opposed Jaws 1 or" the usual character having at their. inner ends bosses or hubs 2 which are superimposed on each other and pivoted together by a rivet 3'or the like. 7 From the sides of the hubs opposite to the jaws and in the reverserelationgto the position of the jaws on the hubs, short arms14'project. .Pivoted onto these arms and .forming, extensions thereof are opposed spreading handles 5, the pivotal connections beingindicated at fit Shoulders 6 between thehandles and arms prevent outward movement of the handles relative tothe arms beyond a certainglimit, .-while allowing for the inward turning movement of the handles on the pivots. These parts are'so' arranged as in,

fall pliers that Ivvh'en the handles are sepiar'ated the jawsarealso separated, and vice versa. I I I Pr0jecting from'the hubs 2' in the same general, direction as the arms land therebetween are lugs .7, The twolugs are necessarily offset from each-other transversely but. their relatively adjacent transverse faces .are so disposed relative to each other as to form a V-shaped transversely extending opening8 therebetween, said opening being symmetrically. disposed relative 'to' the 1on .gitudinal axis, of the pliers and the apex on the handles is released 'andthey are ail-thereof facingthe pivot 3.1

Inthe drawings similar characters of ref-: er'ence indlcate.correspondlng parts 111 the;

several views:

Fig. 1 is a s1d-e elevation of my improved pliers as engaged witha, nut but before the I handles are contracted to cause the gripping Fittingin the opening 8 and having a width sufiicient to engage both saidadjacent tac'esof the lugs? is a wedge shaped block 7 9;. Thejouter' end of this block is pivoted in common onto a pair oflinks 10 which extend thenceat an acute angle toward the thepivOts In-prder to prevent possible outer' ends; of the handles to'pivotal connec f tions with said handles a short distance from 3 lateral movement of the block relative to the lugs, the coacting; faces of thesepa-rts are shown at 11. 1 I A In operation the pliers are manipulated in to be engaged with a nut 12 ether part long t nal y? me e an ro ed; a

H119 the usual'manner m'order to enable the jaws to be turned. When spreading the jaws the shoulders 6 engage so that the handles and the arms 4, are rigid from end to end and move as a unit. When contracting the handles without any pressure being on the jaws to resist their closing the shoulders will still remain practically engaged, since the pivots 5" are tight enough to prevent turning of r the handles relative to the arms under block will move further into the opening 8 and will spread the lugs 7. This spreading "or thelugs imparts a closing action to the jaws. The latter will be then firmly gripped against the nut, and when a rotative pressure is imparted to the pliers, with the neutral contracting pressure being maintained on the handles while so doing, said jaws will not have any tendency to slip on the nut or separate; This is because -the leverage force between the handles and the jaws is increased considerably by the interposition of the wedge block.

' From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

\Vhile this specification sets forth in detail the present and preferred construction of the device, still in practice such dev-ia: tions from such detail may be resorted to as do not form a departure from the spirit ,of the invention, as defined by the appended claims. c

Having thus described my invention what I claim as new and useful and desire to se cure by Letters Patent is":

f 1. A pliers comprising "a pairof opposed "jaw and handle members pivoted together intermediate their ends and arranged to cause a contracting movement of the hano dies to normally lmpart a closing movement to the jaws, and means between the handle members and jawsfor increasing the force tending to close the jaws when the handles are contracted.

A pliers comprising a pair of opposed jaw and handle 'niembers pivotedftogether intermediate their 'endsand arranged to cause a contracting movement'of 'th'e h'andles to impart adirect closingfnioveme'nt 'to the jaws when the Iatte'rare free of an move-- meatesisting'1n usae,and me ts awe'en the arms,

the handle members and jaws for increasing the leverage tending to close the jaws when the jaws are engaged with an object and resist closing movement. i

3. A pliers comprising a pair of opposed jaw and handle members pivoted together intermediate their ends and arranged to cause a contracting movement of the handles to normally impart a closing movement to the jaws, one of said handle members having an inwardly breaking pivoted jointi'n termediate its ends, and leverage increasing means between the handle members outwa'rdly of the pivoted point and the jaws for imparting a closing movement to the jaws when said handle member breaks at said joint.

4. A Ipliers comprising a pair of opposed" j am, a pivot connecting the same, opposed handle members for operatingthe jaws, op-' posed lugs formed rigid withthe jaws and projecting beyond the jaw pivot in a direction opposite to the jaws, theadjacent transversely disposed faces ofthe jaws being disposed at an acute angle to each other, a wedge block to fitbetween and engage said faces, and "means between the handle members and block for causing the latter to move lengthwise of the lugs to spread the same and inove the'ja'ws toward'a closed position, when the handle members are contracted.

-6.'-A structure as in claim" '5 in which means is provided between the handles and arms for preventing outward turning of the handles on the arms beyond 'CGltfllIl position; the links being arranged to cause, the wedge to be still engagedwiththe lugs when the handles aresipread to their fullest extent and are in said certain position relative to 7. A structure as in claim 6, guide means being provided between the'c'ontractmg faces of the wedgeyand lugs to prevent'lateral displacement of the block. 7 s 7 7 In testimony whereof-I atfix signature.

JOHN Wang's,

life) 

